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I've got an 01' RD688S dump. I'm getting a side to side wobble it seems like from 40-45 mph and again from 60-65 mph. It doesn't seem like a death wobble I'd say but it is enough for concern. I have brand new balanced steer tires on and it still does it. When they changed the steers they noticed one of the dog ears on the driver's hub was broken off and they said this could be the problem and I would need a new hub. It makes sense, but I don't want to take a tire mans word to make a 1K dollar repair. What do y'all think? Within the last year I have had the kingpins and tie-rod ends replaced. I have all but two drives replaced in the last two months. Any ideas?

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Check your tie rod ends, drag link, etc. I drove an international oil truck one winter that had a tie rod end just about ready to fall off when I started the season. Told the boss it was about ready to fall off, he asked how I knew it was bad and I told him I could grab it and wiggle it all over. All the other drivers had just told him "steering has a wobble!" Needless to say it was fixed a day or two later. Truck had a nasty wobble as the one wheel would flap all over the place from such a worn out ball joint.

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Thanks for the replies all. Had to get a tire replaced so I had them jack it up. There’s more than one rim bent in the drives. The vibration was more coming from the rear, no bump or anything in the steering wheel at all. With the whole rear off the ground my very old and wise suspension/alignment/tire guy put a wheel spinner on and got them up to all speeds. Once up to speed both axles were vibrating so bad it almost jumped off the stands. He it was so bad he couldn’t tell which rims may be bent. I’m having 2 tires put on next week and gonna balance all the drives and go from there.